Pr series rare earth super magnetostric tive material and its preparing method

A giant magnetostrictive and rare earth technology, which is applied in the composition and manufacture of praseodymium rare earth giant magnetostrictive materials, can solve the problem of Laves single-phase compounds that cannot achieve anisotropic compensation composition point and cannot synthesize large magnetostriction 、 Difficult to obtain cubic Laves single equality problem

Inactive Publication Date: 2007-12-05
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Tb 1-x PR x Fe 2 In the pseudo-binary system, when the Pr content x>0.2, it is impossible to synthesize Laves single-phase compounds with large magnetostriction, and there is no way to reach the anisotropy compensation composition point
In recent years, researchers have made a lot of efforts to study Tb 1-x PR x Fe 2 The phase formation rules and magnetostrictive properties of pseudo-binary phase compounds are mainly achieved by replacing Pr with rare earths Dy and Ce, or doping B and other elements to stabilize Laves phase compounds containing Pr, but when the content of Pr atoms in rare earth When it exceeds 30 at.%, it is difficult to obtain cubic Laves single phase
The above results show that it is difficult to synthesize rare earth giant magnetostrictive materials with high Pr content by conventional preparation methods (such as smelting and atmospheric pressure annealing)

Method used

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  • Pr series rare earth super magnetostric tive material and its preparing method
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Embodiment 1

[0031] Composition is Pr 0.9 Tb 0.1 Fe 1.9 alloy. Raw materials with a purity of 99% Tb, 99% Pr, and 99.5% Fe are measured according to the formula Pr 0.9 Tb 0.1 Fe 1.9 (atomic ratio) ratio. The proportioned raw materials are put into the crucible of the arc melting furnace, and the alloy ingot with uniform composition is obtained by arc melting. The brittle alloy ingot is broken into powders with a diameter of 2 to 5 mm, put into a mold with a diameter of 10 mm and a length of 20 mm, and preformed with a pressure of 50 MPa. Then wrap it with Ta skin, put it into a pyrophyllite mold with a diameter of 11mm, keep it warm at a pressure of 6GPa and a temperature of 900°C for 30 minutes, and then cool it to room temperature under pressure. Finally, a rod of praseodymium rare earth magnetostrictive material is obtained. The x-ray diffraction pattern and magnetostrictive properties of this material are shown in Figures 1 and 2.

[0032] Experiments of the present invention ...

Embodiment 2

[0035] Composition is Pr 0.9 Tb 0.1 Fe 1.9 alloy. Raw materials with a purity of 99% Tb, 99% Pr, and 99.5% Fe are measured according to the formula Pr 0.9 Tb 0.1 Fe 1.9 (atomic ratio) ratio. The proportioned raw materials are put into the crucible of the arc melting furnace, and the alloy ingot with uniform composition is obtained by arc melting. Put the alloy into the melt rapid quenching equipment, use medium frequency induction heating to melt the alloy to form an alloy solution, and make the alloy solution pass through the water-cooled copper wheel with a rotation speed of 30m / s, and throw it into strips where nanocrystalline and amorphous coexist . Break the strips into powders with a size of 2-5 mm, put them into a mold with a diameter of 10 mm and a length of 20 mm, and preform with a pressure of 50 MPa. Then wrap it with Ta skin, put it into a pyrophyllite mold with a diameter of 11mm, keep it warm at a pressure of 6GPa and a temperature of 600°C for 30 minutes...

Embodiment 3

[0037] Composition is PrFe 1.9 alloy. Raw materials with a purity of 99% Pr and 99.5% Fe are measured according to the formula PrFe 1.9 (atomic ratio) ratio. The proportioned raw materials are put into the crucible of the arc melting furnace, and the alloy ingot with uniform composition is obtained by arc melting. The brittle alloy ingot is broken into powders with a diameter of 2 to 5 mm, put into a mold with a diameter of 10 mm and a length of 20 mm, and preformed with a pressure of 50 MPa. Then wrap it with Ta skin, put it into a pyrophyllite mold with a diameter of 11mm, keep it warm for 30 minutes at a pressure of 6GPa and a temperature of 700-900°C, and then cool it to room temperature under pressure. Finally, a rod of praseodymium rare earth magnetostrictive material is obtained. The x-ray diffraction pattern and magnetostrictive properties of this material are shown in Figures 1 and 2.

[0038] When the pressure is 50 MPa and the temperature is 300-900° C. for 60 ...

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Abstract

This invention provides a Pr series rare earth super magnetostriction material and its preparation method, and the chemical components (atomic ratios) are: Pr1-x(Tb1-yREy)x(FelMz)RE represents for Dy, Sm, Ho, Er, Ce, Nd and etc rare earth elements; M represents one or several kinds of B, Si, C, Zr, Nb, Cu, Mn, V, Ti, Cr, Ga, Co, Ni, w, Hf, Ta, Mg. (0 is less than or equal to x is less than or equal to 0.6, 0 is less than or equal to y is less than or equal to 1, 0 is less than or equal to z is less than or equal to 0.4, 0 is less than or equal to t is less than or equal to 4.) The preparation method is : use high-pressing technology to compose the Pr series rare earth super magnetostriction material with high Pr content that the usual pressure cannot realize. This invention greatly lowers the cost of the present material and maintains high magnetostriction performance.

Description

1. Technical field [0001] The invention relates to a composition and a manufacturing method of a rare earth giant magnetostrictive material, in particular to a composition and a manufacturing method of a praseodymium rare earth giant magnetostrictive material. 2. Technical background [0002] Rare earth giant magnetostrictive materials (Giant Magnetostrictive Materials) refer to materials that produce super large stretching deformation under the action of an external magnetic field. Compared with piezoelectric ceramics (PZT), rare earth giant magnetostrictive materials have their unique properties: the stretching strain at room temperature reaches 1500-2000ppm, which is several times that of piezoelectric ceramics (250-400ppm); Energy density (14000-25000J / m 3 ), high energy conversion efficiency, can generate a large mechanical force, and respond quickly. It can be widely used in underwater acoustic transducers, controller valves, brakes, sensors and other fields. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C28/00C22C30/00C22C1/04
Inventor 唐少龙时阳光都有为
Owner NANJING UNIV
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